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具备有效存储和读取光的相干态的能力是实现连续变量量子信息存储的关键。本文研究了利用混合光子回声技术对光场的相干态进行存储和读取。光量子态被记录在原子系综的基态的两个相干能级中从而实现长时间的量子态存储。考虑到由于原子退相干的噪声效应,我们发现在目前可实现的技术条件下存储保真度仍然高于保真度阈值2/3。我们的研究为实现高效准确的基于量子回声技术的光量子态存储提供了一些切实可行的实践指导。
Having the ability to effectively store and read coherent states of light is the key to achieving continuous variable quantum information storage. In this paper, the hybrid photon echo technique is used to store and read the coherent state of the light field. The optical quantum states are recorded in two coherent levels of the ground state of the atomic ensemble for long-term quantum state storage. Considering the noise effects due to atomic decoherence, we find that the storage fidelity remains above 2/3 of the fidelity threshold under the currently achievable technical conditions. Our research provides some practical guidance for realizing efficient and accurate quantum state storage of light based on quantum echo technology.